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Testing printer accuracy by using anatomic models. By using computer-aided design (CAD) software, a skull STL model (left) is augmented with fiduciary markers (blue spheres) (middle) to yield a new STL model (right). The locations of the markers on the printed model can be measured with, for example, calipers or automated coordinate-measuring machine systems and compared with the locations of the markers on the designed STL model.
